Yes. You have been betrayed and your option is to either sit it out or vote for a party with absolutely no political pull whatsoever. You will have the comfort of being absolutely true to your convictions. You will be pure and in a position to throw stones at anyone who is actually trying to solve the problem.
You, on the other hand, will get to think your choices are making a difference, when in fact you are being played like a fiddle. My vote will, as you point out, be meaningless; what you fail to realize is that yours is equally so.
Fortunately, I can laugh about it. I doubt that you can. I win.